Re: [TCML] NST primaries

["Mark Olson" <kc5gym@xxxxxxx>]

Thanks Deano,

By the way, that is nice work.
The pressure cooker made a cool looking case.
I like the safety gaps.
Good craftsmanship.
The series/parallel switch is a nice touch.  I had considered that.

Later,
Marko

----- Original Message -----
From: "David Dean" <deano@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, June 04, 2008 6:12 PM
Subject: Re: [TCML] NST primaries


> Hi
>
> On Wednesday 04 June 2008 05:19:57 pm Mark Olson wrote:
> > Hello all,
> >
> > My NST, originally a 15kv@120mA, has two prmary windings and two
secondary
> > windings. The primary windings are paralleled for 120v input.
> >
> > If I rewire the transformer primaries in series (keeping phasing
correct)
> > can It be used with 240v input?
> >
> Yes it can. I have done that with a 15/60 Francformer. You can see the
result
> at:
> http://deanostoybox.com/nst_modifi.htm
>
> After frying the secondaries by inputting 2.8kVA with a much larger than
> resonant tank cap (burned the insulation off of the secondary windings), I
> removed the transformer and used it for a ballast for (one of) my
polemount
> distribution transformers. The two 120V primaries in series for use with
240V
> input of course. In that configuration the measured short circuit current
of
> the pig was 85mA.
>
> > I want to do this to decrease the input current requirement.
> >
> > Thanks,
> > Marko
> > kc5gym
>
> later
> deano
>
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